Counter-evaporator



I Patented Aug. 11, 1931 UNITED STATES PATENT oFF1cE-- ROBERT GLENN OSBORN, OF BELOIT, WISCONSIN, ASSIGNOR '1.0 NATIONAL REFRIGERA- TION CORPORATION, OF BELOIT, WISCONSIN, A CORPORATION OF DELAWARE COUNTER-EVAPORATOR Application led May 311930. Serial N'o. 458,848.

This invention relates to the construction of'an evaporator and more partcularly to an i vto provide an evaporator which has the reuired amount of surface produce the deslred coolin effect withln an elongated chamber suc as a counter-cabinet and to further provide such an evaporator which will permit the use of ammonia as a refrigerant therein.

A thorough understandin of this inven* tion will be had from the fol owing description given in connection with the drawings in which:

Fig. 1 is a plan view of an evaporator and supply therefore constructed in accordance with this invention.

Fig. 2 is a front elevation ofthe evaporator portion.

Fig. 3 is a vertical transverse section through the evaporator without the fins thereon. Y

Fig. 4 is a section of a tube from which the evaporator conducting portion is made.

Fig. 5 is an end elevation of the connecting end of the evaporator, and

Fig. 6 is an elevation of a iin element.

The evaporator through which the refrigerant is circulated may be supplied from any suitable source and can best be described by the method of making the-same.

Referring particularly to Figs. 3 and 4, it will be seenv that the evaporator is formed from a piece of tubing 1 having twol sides thereof pressed together to provide a Afiat center section 2 having a restricted practically closedthin web-like passage 3 therebetween terminating in longitudinal passages 4 at each end thereof formed by the end portions 6 of the tubing 1. The evaporator 6o may conveniently be'made by squashing any suitable length of tubing as shown in Fi 4 into the shape illustrated in Fig. 3. he tubing thus formed is sealed at one end 7 and provided with a connecting flange 8 at the other end the passage 3 at the connecting end being sealed by the flange. The evaporator formed. in this lmanner lprovides a pair of spaced parallel refrigerant chambers 4 connected throughout their lengths by a thin web-like passage 3. v

Any suitable number of fins 9 may be slid over the evaporator the fins of course being provided with a central aperture 11 of proper shape to fit over the evaporator.

The evaporator may be secured to any source of supply such as a reservoir 12, preferably a liquid ammonia receptacle of the flooded type which will supply liquid ammonia to the evaporating member. Preferably the lower channel 4 is connected to the Vreservoir below the liquid level and the upper channel above the liquid level. As shown, the reservoir 12 may also be rovided with fins 13 to give additional sur ace area to the entire unit. The reservoir 12 may be supplied from a liquid line and discharged through a suction line 15.

The construction just described rovides an evaporator which has a relative y large surface area and yet which occupies very little physical space .in a cabinet. .It hasbeen found that such an evaporator when installed in a counter-cabinet and supplied with liquid ammonia as arefrigerant will maintain the compartment at practically any desired temperature'.

It is obvious that one or more evaporating units may be supplied from a single source and that changes may be made in the details of construction without departing from the spirit and scope of this invention as defined in the claims appended hereto.

I claim:

1. An evaporator comprising a pair of substantially parallel spaced longtudnal refrigerant chambers connected substantially throughout their lengths by a relatively thin web-like passage. v

2. An evaporator comprising a pair of substantially parallel spaced longitudinal refrigerant chambers connected substantially throughout their lengths by a relatively thin web-like passage and radiating ins arranged on said member. Y

3. An evaporator comprising a pair of substantially parallel spaced longitudinal refrigerant chambers connected substantially throughout their lengths by a relatively thin Web-like assage, said chambers being closed at one en said passage being closed at both ends, the o en ends of said chambers being adapted to. e connected to a liquid refrigerant reservoir.

4. An evaporator comprising a length of tubing having the Walls ther'eoflniashed t0- gether at the center to provide a pair of parallel spaced chambers connected throughout their length by a relatively thin passage between the Walls of the mashed portion of said tubing.

In witness of the foregoing l affix my signature.

R. GLENN OSBRN. 

